Click on the “My Account and Ward” link in the top right of the page and then click the “Account Settings” menu option.
Click on the “Forgot your username?” link.
Click on the “Membership Record Number (MRN)” option and enter your Membership Record Number (MRN) and your birth date information. Click the “Recover” button. If you do not know your membership record number, you can look it up on the LDS Tools app or ask your ward clerk.
If you receive an error indicating "This recovery option is not available for this account." you will need to contact the Global Service Center for the Church of Jesus Christ of Latter-day Saints to recover the username. They can be reached by calling 1-855-537-4357.